Hybrid DC circuit breaker sharing main through-flow branch and protection device and method of circuit breaker

Abstract

The embodiment of the invention discloses a hybrid direct-current circuit breaker sharing a main through-flow branch and a protection device and a method. The hybrid DC circuit breaker is provided with a first main conduction branch circuit and a second main conduction branch circuit, and each of the first main conduction branch circuit and the second main conduction branch circuit corresponds toone DC branch circuit in a multi-terminal DC system. A first isolation switch and a first reversing switch are arranged in the first main conduction branch circuit, a second isolation switch and a second reversing switch are arranged in the second main conduction branch circuit, a third isolation switch electrically connected with the first load side is arranged, and a fourth isolation switch electrically connected with the second load side is arranged. The first main conduction branch circuit and the second main conduction branch circuit can share one set of main through-flow circuit and protection device; therefore, the number of used main through-flow circuits and protection devices between adjacent direct-current branches is reduced, integration of the hybrid circuit breakers on the adjacent direct-current branches is achieved, and the size and cost of the hybrid circuit breakers are reduced.

Description

technical field [0001] Embodiments of the present invention relate to the field of electrical technology, and in particular to a hybrid direct current circuit breaker and a method thereof that share a main flow branch and a protection device. Background technique [0002] Compared with AC transmission, DC transmission has the advantages of low line loss, large transmission capacity, long transmission distance, and no problem of system synchronous operation stability. Among them, DC circuit breaker is an important equipment for DC transmission. [0003] At present, the hybrid DC circuit breaker, which is composed of mechanical switches and power electronic devices, has low loss in normal operation and can quickly and effectively break the circuit in fault protection. However, for a multi-terminal DC system, one terminal is usually connected to multiple branches. In order to ensure that the fault can be quickly cut off without affecting the normal operation of other branches w...

AI Technical Summary

Problems solved by technology

However, for a multi-terminal DC system, one terminal is usually connected to multiple branches. In order to ensure that the fault can be quickly cut off without affecting the normal operation of other branches when a fault occurs in one of the branches, it is necessary to connect a circuit breaker to each branch. , which makes it possible to install multiple hybrid circuit breakers at the same terminal. A single hybrid circuit breaker already requires a lot of space and cost, and the space and cost required to install multiple hybrid circuit breakers at the same terminal are greatly increased, limiting Practical application of hybrid circuit breaker

Images